// ajax请求函数模块
// 返回值为promise对象(异步返回的是 response.data)
import axios from 'axios'
export default function ajax (url,data={},type="GET"){
    return new Promise(function(resolve,reject){
        //执行异步ajax请求
        let promise
    if(type === 'GET'){
        //准备url query 参数数据
        let dataStr = '' //数据拼接字符串
        Object.keys(data).forEach(key => {
            dataStr +=key + '=' + data[key] + '&'
        })
    if (dataStr !== ''){
        dataStr = dataStr.substring(0,dataStr.lastIndexOf('&'))
        url = url + '?' + dataStr
    }
    //发送get请求
    promise = axios.get(url)
    } else {
        //发送post请求
     promise = axios.post(url,data)   
}
    promise.then(function(response){
        //成功了调用resolve()
        resolve(response.data)
    })
            .catch(function(error){
         //失败了调用reject() 
         reject(error)      
    })
        
    })
    return promise
}